Apple may be moving ahead with its larger 5.5 inch iPhone, but according to a new report it’s running into a few problems along the way.

Reuters reports that while Apple is set to begin mass producing displays for its 4.7-inch iPhone as early as May, the eagerly anticipated 5.5-inch version is suffering supply chain issues relating to the production of in-cell technology for the larger screens.

Over the weekend, a rumor from overseas claimed that Apple will announce a 4.8-inch iPhone “Math” alongside a 4-inch iPhone 5S. But it didn’t stop there; the same sources also said that a third iPhone model with a 12-megapixel camera is set to debut “before Christmas” this year. Sounds farfetched, to say the least.

What seems like a good bet for Apple’s 2013 iPhone plans is the prospect of a less expensive model geared towards emerging markets like China. According to a new rumor today, Apple is readying two 4-inch iPhones for 2013 with in-cell display technology. But what about the iPhone Math?

Longtime supplier of smartphone panels to Apple, LG Display, has begun producing a new, thinner display that is thought to be for use in the upcoming iPhone 5 from Apple. The production schedule is in line with the rumored September 12th announcement of the new iPhone model.